I think that it would be great to have an "instant death" event that immediately causes the player to lose a life. I also want to see a level property such that you could make the player die upon touching the bottom of a level (like in Mario, where if you fall off the screen, you die).

It would also be good if you could make an 'autoscroll' type level, in which the creator must simply supply the speed and path of the scrolling. Any player who gets stuck between the end of the screen and a wall dies and any player who falls off the bottom of the screen also dies.

I think these would be really useful to a level creator.

~Slix